I can't seem to get my Calculator off the ground. It seems so damn easy to make an application that can enter text into a Textbox, I can't seem to get the damn thing to calculate a value, ... I can do this very easily if I don't have any buttons or textboxes, I can calculate any number I like, ...
Simple Example, Put Imports System.Math at the Top.
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The string itself contains things like "random" & random.next(1,3) & "random2" etc. The string registers all of this as a string and doesn't actually calculate random numbers.Is there any way to fix this?
View 8 RepliesThe intent of the code is to open an xls file -minimize it , search for keywords . there are columns like test case name ,priority(simple ,medium and high) with associated keywords.If keywords are found, it shld save the test case name - Priority in a text box. When i run this code i am getting err in
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I have a class that overrides Ctype operator to have conversion from and to String :
Public Class TotoToString
Property value As String
Public Sub New(ByVal V As String)
Me.value = V
End Sub
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Dim ip_list, ipa, ipb, ip_start, ip_block, ip_end
Dim Response = Nothing
Dim SubNetMask
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I am building an equation parser, it takes the equation
"( 3456 + 321 * X ) / 45"
For example. As I couldn't find a direct solution to parse this equation, I split the equation and started implementing the operations 1 by 1 until I stuck with the execution order of the arithmetic operators (as the multiplication should be performed before the addition). So I am trying now to avoid this and try to parse the full equation. Is there a way to convert the string "+" to + for example?
I am working on a site that I would like to pass information from one page to another. For some reason I keep getting the above error.
//Code
Partial Class Customer
Inherits System.Web.UI.Page
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I am working on a site that I would like to pass information from one page to another. I'm new to asp.net but not other languages, I'm just trying to learn some stuff. For some reason I keep getting the above error. The code I am using looks real similar to the code in the Murach book I am looking at
View 6 RepliesPrivate Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim connectionString As String
Dim cnn As OleDbConnection
Dim adptr As OleDbDataAdapter
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Given a string as a form of input (parsed from an input file) which represents a number and a mathematical operator (<, >, <=, >=, !, !=, and a few others), what is a really fastefficient way to chop off that operator, compare it to a list of valid operators, and then set an "operator" variable to a state (i.e., Enum) representing the identified operator, then return just the number (as a string)?I'm open to various ideas and implementations.I've tried several (about 6-7) myself, and find I'm not really satisfied with the speedThe fastest so far is a For Each loop that walks my list of "valid operators", and compares that operator's string representation against the chopped off bit from the numeric string. I determine the amount to chop off by the length of each valid operator in the valid list.
Here's a code example of the fastest implementation. Assume input like <378 and a valid ops list of <, >, !, or >=79 and a valid ops list of <=, >=:
Friend Function FindMatchingOp(ByVal Haystack As String,
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In a SQL UPDATE statement, how to i "set" a field to empty? (because it was occupied before). i get a syntax error (missing operator) that points to my sql string this is the update command i am using but its not working.
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I have a problem with Operator '&' someone may with this problem.
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I am trying to concate string and system.type using operator & in VB and i am getting error :
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i have problem using insert into query for values = "Import With Pre.Tariff (Asean,Cept,C'wealth)" it keeps saying
Syntax error (missing operator) in query expression ''Import With Pre.Tariff (Asean,Cept,C'wealth'.
it seems is it cannot reads ) and show missing operator but this is a string not operator for "Import With Pre.Tariff (Asean,Cept,C'wealth)" this whole thing is sting from datagridview .. any how to make it insert into database without system prompt missing operator problem ???
which is apostrophere problem i used single quote but system read like dat
''Import With Pre.Tariff (Asean,Cept,C'wealth'.. it drops ')'
G3_select =
"insert into tblrk1stt (JOB_NO, [COUNTER], RES_CODE,
ERR_DESC, REMARK, LINE_NO) VALUES ('" & G3_value4 &
"', '"
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i try to put picture in mysql with vb.net, first i convert with this function : [code] i try to use that function for storing picture to mysql database : INSERT INTO myImage (image) VALUES ('" & convertImage(PictureBox1.image) & "');and then i have this error : Operator '&' is not defined for types 'String' and '1-dimensional array of Byte'i create a table (myImage) with image field (LongBlob)
View 1 RepliesI am writing a library in VB.NET in which I have added, among others, a class originally written in C# but converted into VB.NET. I don't know much about C# so therefore I have used online C# to VB.NET-converters. Now I am stuck with some code which I believe the online-converter was not able to "translate" properly.
When running the code I get the following error:
System.IndexOutOfRangeException was unhandled
Message="IndexOutOfRangeException"
StackTrace:
at System.String.get_Chars()
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i am downloading data from xml using linq library those data i want to add them on a textblock item
TextBlock1.Text = TextBlock1.Text & result
but it has an error :
Error 1 Operator '&' is not defined for types 'String' and 'System.Xml.Linq.XElement'.
When i am changing this line to :
TextBlock1.Text = TextBlock1.Text & result.Tostring
it works but it adds this data :
"<"data> data <"/data>
instead of :
hello
I am having a problem in the following codes
Problem in "'" & rawData & "'")"
Error Message Operator '&' is not defined for types 'String' and '1-dimensional array of Byte'.
Complete Coding:
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim fileSize As Integer
Dim rawData() As Byte
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Is there a method to calculate an equation from a string that looks something like "(1 + 1) * 2"?
View 9 RepliesIt's possible to calculate a string that has a formula something like:
dim val as integer
dim formula as string = "(5/1.5) + 10"
val = formula
And the result should be 13.33
Is there a method to calculate an equation from a string that looks something like "(1 + 1) * 2"?
View 2 Replieswith this code dont know wht its not working source = wc.DownloadString(String.Format("http://" & cboHSearch & "/cse?cx=013269018370076798483:gg7jrrhpsy4&cof=FORID:1&q=" + cboEngine.Text + "&sa=Search", Me.cboEngine.Text.Replace(" "c, "+"c), resultCounter))
View 5 RepliesI have the following hex string 40 50 4C 41 59 0D I am transmitting to a piece of equipment, I need to calculate a checksum value to add to the string as the last byte to be sent. The checksum byte is generated in such a manner that the result of addition of all bytes of a message will become 11111111(255). the code that you see here does not work can anyone tell/show me why? Whats important is the checksum calculation.
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I have a text box for user key in a formula,like '1+3-5',and i need to solve and display the answer.
Also need to handle the brackets,like '9+(2*4)'.
Operation is plus,minus,multiply,devide.
does anyone know how to calculate a textbox string to be a CRC16 value?
View 7 RepliesI am tightening up my coding with the Option Strict set to ON. It has now produced alot of errors. An example of this is:
If AllocatedDGV.Rows(i).Cells("RoomNumber").Value = RoomsAvailableDGV.Rows(j).Cells("RoomName").Value Then
It gives me the following error: Option Strict On disallows operands of type Object for operator '='. Use the 'Is' operator to test for object identity.
I need to write an interface to get data to/from our data files.
We have a low level class that holds field values for each record read from the files.
This just holds two values, the value read from the file (DBValue) and the updated value that may need to be written back to the file (CurrentValue).
These values may be any of the standard value types (integer, date etc) or a string.
Either value (DBValue or CurrentValue) may be null if not defined.
I have written the class to manage this data which works fine while option strict is NOT on.
But we have an office policy of having option strict on all the time.
When I put option strict on, my object value comparisons fail with the error: "Option Strict On disallows operands of type Object for operator '='. Use the 'Is' operator to test for object identity."
Question, how should I change the following code to handle option strict on ...
This is all running on Visual Studio 2010
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Possible Duplicate: Is there a conditional ternary operator in VB.NET?
Can we use Coalesce operator(??) and conditional ternary operator(:) in VB.NET as in C#?
I'm in a bit of a pickle. I'm new to Visual Basic and I have been writing a simple program to rate movies. I'm stuck on calculating the average from the text file. The text file holds the numbers from 1 - 10 (ratings). I want my program button to add all the values from the text file and display the average from the total amount of ratings and display them into a text box.
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I am hoping that someone can help me with a problem I've got at the moment using Compact Framework.Net 2 SP 2.At the moment I have a UI with a series of text boxes and each textbox displays the contents of a database field. These are shown one beneath another with a scroll bar on the right hand side of the form. Each textbox has a set width which might.I would like to adjust the height each text box based on the number of lines it is holding, the font size and the font in order to avoid using scroll bars on each textbox.[code]
View 3 Replies